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Renderer: Blit texture to window instead of using a full renderpass

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This may improve performance and allow for render targets to customize how they blit the final texture (allowing for render-to-texture)
This commit is contained in:
SirLynix
2023-11-17 16:59:31 +01:00
parent f2e77fb8a5
commit 97d5640967
38 changed files with 448 additions and 265 deletions
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70
src/Nazara/OpenGLRenderer/Wrapper/Context.cpp
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@@ -310,7 +310,7 @@ namespace Nz::GL
}
}
bool Context::BlitTexture(const OpenGLTexture& texture, const OpenGLTexture& destination, const Boxui& srcBox, const Boxui& dstBox, SamplerFilter filter) const
bool Context::BlitTexture(const OpenGLTexture& source, const OpenGLTexture& destination, const Boxui& srcBox, const Boxui& dstBox, SamplerFilter filter) const
{
if (!m_blitFramebuffers && !InitializeBlitFramebuffers())
return false;
@@ -363,7 +363,7 @@ namespace Nz::GL
};
// Attach textures to color attachment
BindTexture(m_blitFramebuffers->readFBO, texture);
BindTexture(m_blitFramebuffers->readFBO, source);
BindTexture(m_blitFramebuffers->drawFBO, destination);
// Validate framebuffer completeness
@@ -383,6 +383,29 @@ namespace Nz::GL
return true;
}
bool Context::BlitTextureToWindow(const OpenGLTexture& texture, const Boxui& srcBox, const Boxui& dstBox, SamplerFilter filter) const
{
if (!m_blitFramebuffers && !InitializeBlitFramebuffers())
return false;
// Bind framebuffers before configuring them (so they won't override each other)
BindFramebuffer(FramebufferTarget::Draw, 0);
BindFramebuffer(FramebufferTarget::Read, m_blitFramebuffers->readFBO.GetObjectId());
// Attach textures to color attachment
BindTextureToFramebuffer(m_blitFramebuffers->readFBO, texture);
// Validate framebuffer completeness
if (GLenum checkResult = m_blitFramebuffers->readFBO.Check(); checkResult != GL_FRAMEBUFFER_COMPLETE)
{
NazaraErrorFmt("blit read FBO is incomplete: {0}", TranslateOpenGLError(checkResult));
return false;
}
glBlitFramebuffer(srcBox.x, srcBox.y, srcBox.x + srcBox.width, srcBox.y + srcBox.height, dstBox.x, dstBox.y + srcBox.height, dstBox.x + dstBox.width, dstBox.y, GL_COLOR_BUFFER_BIT, ToOpenGL(filter));
return true;
}
bool Context::ClearErrorStack() const
{
assert(GetCurrentContext() == this);
@@ -1196,4 +1219,47 @@ namespace Nz::GL
return true;
}
void Context::BindTextureToFramebuffer(Framebuffer& framebuffer, const OpenGLTexture& texture)
{
if (texture.RequiresTextureViewEmulation())
{
const TextureViewInfo& texViewInfo = texture.GetTextureViewInfo();
if (texViewInfo.viewType != ImageType::E2D)
throw std::runtime_error("unrestricted texture views can only be used as 2D texture attachment");
const OpenGLTexture& parentTexture = *texture.GetParentTexture();
switch (parentTexture.GetType())
{
case ImageType::Cubemap:
{
constexpr std::array<GLenum, 6> faceTargets = { GL_TEXTURE_CUBE_MAP_POSITIVE_X, GL_TEXTURE_CUBE_MAP_NEGATIVE_X, GL_TEXTURE_CUBE_MAP_POSITIVE_Y, GL_TEXTURE_CUBE_MAP_NEGATIVE_Y, GL_TEXTURE_CUBE_MAP_POSITIVE_Z, GL_TEXTURE_CUBE_MAP_NEGATIVE_Z };
assert(texViewInfo.baseArrayLayer < faceTargets.size());
GLenum texTarget = faceTargets[texViewInfo.baseArrayLayer];
framebuffer.Texture2D(GL_COLOR_ATTACHMENT0, texTarget, parentTexture.GetTexture().GetObjectId(), texViewInfo.baseMipLevel);
break;
}
case ImageType::E1D:
case ImageType::E2D:
framebuffer.Texture2D(GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, parentTexture.GetTexture().GetObjectId(), texViewInfo.baseMipLevel);
break;
case ImageType::E1D_Array:
case ImageType::E2D_Array:
case ImageType::E3D:
framebuffer.TextureLayer(GL_COLOR_ATTACHMENT0, parentTexture.GetTexture().GetObjectId(), texViewInfo.baseArrayLayer, texViewInfo.baseMipLevel);
break;
}
}
else
{
if (texture.GetTexture().GetTarget() != TextureTarget::Target2D)
throw std::runtime_error("blit is not yet supported from/to other texture type than 2D textures");
framebuffer.Texture2D(GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture.GetTexture().GetObjectId(), 0);
}
}
}